Liner hanger



Dc. l., 19142. G. D. JHNsoN -E'rAL V 2,303,556 i LINBRHANGER v F i Filed July 2, 1940 3 Sheets-sheet -2 Dec. 1\, 1942.v v1:5, D. .Jol-n vsoNl 1:71- AL LINER HANGER Filed July 2 1940 v3 Sheets-Sheet 3 M y S55/M rNM ,b $1 Q, MJ ,IA f e GPM d5. n www diameters.

Patented Dec. l., 1942 sv PAT LINER HANGER Glenn 'D. Johnson, Compton, and Spencer W.

Long, Inglewood, Calif., assignors to Baash- Ross Tool Company, Los Angeles, Calif., a corporation of California f Application July 2, 1940,'seria1 No.1343g614 rIihisinvention relates to a well tool an-drelates more particularly to aV liner hanger. A general object of this invention isrto provide a practical and effective liner hanger that may be. readily f operated orset under practically any conditions.

Another object of this invention is to provide a liner hanger that may be positively operated to securely and dependably suspend a liner, or the like, under all conditions of operation. The improved liner hanger of thev present invention may be' successfully and easily operated `to dependably suspend the liner in situations where the liner is caught inthe well, where thelin'er canbe readily released and withdrawn from A'the Well when it is desired to repair or replace the liner nection and operating connection between the hanger body and the setting unit that dependably transmits the forces required for vtherelease and actuation of the 'slips and yet requiresa minimum wallthicknessat the hanger body.V

A further object of this invention is to provide a releasable packing type liner hanger thatmay or hanger. f K

The various objects'and features of our invention will be fulIy understood from the follow-4 ing detailed description of a typical*` preferred not be turnedin the well, Where the liner is free in the well, and where it is undesirable to engage the liner With the bottom of the well.

. Another object of this invention is toprovide a releasable packing type liner hanger in which the liner may be washed out or flushed with suitable'circulation fluid following the setting of the slips an'dprior to the actuation or expansion of the packing.- k

Another object of this invention is to provide a liner hanger that is compactV and capable of embodiment in sizes for use inv casings of small The liner hanger Vof the present invention requires only two telescoping elements at any one horizontal plane and these elements may be constructed with sufficient wall thickness t'o have adequate strength without'unduly in-. creasing the external diameter or the internal diameter of the tool. A

Another objectof this invention is to provide a liner`hanger embodyinga novel control means or latch means thatr is positive and cannot beform and applicationof the invention, throughout which description reference is made cto the accompanying drawings, in which: l

Fig. 1 is a sidev elevation of the liner hanger provided by this invention suspended from a setting stringand in condition for operation in a well casing. Fig. 2 is an enlargedfragmentary vertical ,detailed sectional view of'the'principal partsof the liner hanger' in the initial or unactuated positions. Fig.,3 is a fragmentary' detailedsectional .view taken in a plane spaced from the plane of Fig. V2 .illustrating one of the spring actuating means of a slip.YV Fig. 4 is a fragmentary longitudinal detailed sectional`v view of the tool showing vthe slips actuated and the control or latch means released. Fig. 5 i's'a view similarto Fig. -4 showing `thepacking actuated and the setting unitybeing withdrawn from the VHwell, the setting unit appearing inside elevation. `Fig. 6 is a transverse detailed sectional view come unintentionally released when the setting string is made up and run into the well, and yet maybe readily controlled to set-the slips and actuate the packing. f

Another object of this invention is to provide a liner hanger in which the friction means, the latch means, the slip restraining fingers and the related parts are all recovered and Withdrawn Y from the Well following setting of the tool, leaving only the essential hanger body, -slips and packing associated with the liner. Y 4

Another object of this invention Vis to provide a liner hanger of the character mentioned in which the setting unit may be readilycondi- ,.tioned for use with slip and packing units intended for installation in casings of different diameters. Y

Another object of this invention is to provide n a liner hanger of the character referred to embodying a novel screw threaded releasable contakenas indicated by line 6-6 on Fig. 2. Figs. 7 and are enlarged transverse detailed sectional viewsv taken. as indicated by lines 'l--lrand 8 8.

respectively, on Figl. Fig. .9. is an enlarged transverse detailed sectional view taken as indicated by line 9 9 on Fig. 5. Fig. 10 is an enlarged fragmentary stretchout view of the pin and slot means and Fig, 11 is a fragmentary longitudinal detailedV sectional view of a modied form of construction. f

, The improved liner hanger of the present .invention may be said to comprise, generally, a hanger body I0 to be secured to the upper end of a liner L, slipsY H carried by the body I0 for gripping the interior of fa casing C to suspend` the liner L, packing means I2 onthe body l0 for sealing with the interior of the casing C, a re' leasable operating connection I3 between'a setting string S and the body l0, and a restraining means or control Il `forthe slips Il.

The body l0 of the liner hanger is an elongate tubular member proportioned to be receivecun the casing C with suitable clearance. The lolwer portion of the body I is externally threaded to receive a collar or coupling I5. The coupling I5 may directly thread on theliner L or, as illustrated, may be threaded to a nipple I5l on the upper end of the liner. The external diameter of the body I0 is-increased some distance above the coupling I5 to provide a downwardly'facing external annular shoulder I6. A plurality of spaced longitudinal slots I1 are provided in the wall of the body I0 above the shoulder I6. In the preferred construction illustrated there are three equally spaced slots I1 of like size and shape. The side walls of the slots I1 are -radial with respect to the longitudinal axis of the tool and the upper and lower walls of the slots are flat and horizontal. 'I'he external diameter of the body I0 is again increased at the upper ends of the slots I1. The upper portion constitute a`cone or wedge part for expanding of the body in is shaped to' lll the slips II. In the preferred construction a l series of downwardly and .inwardly sloping` faces I I8 are formed on the exterior of the body I0 some distance above the slots I1. The faces I8 are preferably, though not necessarily. transversely cylindrically curved. An upwardly facing annular shoulder I9 is provided on the exterior of the body I0 some distance below the faces I8. 'I'he shoulder I9 slopes upwardly and outwardly. The

upper extremity of the tubular body I0 is provided with a downwardly and inwardly slopingseat 20. Spaced lateral'ports 2I are provided in the wall of the body I0 below the shoulder I9 and above the slots l1 to facilitate the handling of the fluid employed to flush the liner L. Itis to bey observed that the body I0 just described is a simple, onepiece member.'

The slips I I are arranged on the body I0 to grip the interior of the casing C for the purpose'of suspending the liner L. v A slip Il is provided to engage or ride onl each face I8. The slips II are wedge-like segments having pitched inner sides that conform to the'pitche'd body faces I8 and having cylindrically curved convex outerY faces for conforming generally to the interior of the casing C. Downwardly and outwardly directed kwickers or teeth 22 are provided on the outer sides of the slips II to biter into or grip'the interior of the casing C. Novel means are provided for guiding the slips I I and for holdingthe slips against displacement and loss. A vertical slot 23 is provided in each slip I I. Where a single slot 23 is formed in each slip it is equally spaced between the vertical edges of the slip. rThe side and end walls of the slots 23 ilare outwardly. Screws 24- are threaded into' openings in the body I0 andv have heads25 received in the slots 23. The heads 25 have tapered or conical under sides cooperating with the flared walls of the slots 23. It will beseen that the screw heads 25 cooperating with the slots 23 hold then slips II against displacement and loss yet allow free longitudinalmovement and expansion of lthe slips.

In accordance with the invention the slips I I are spring actuated to automatically expand into gripping engagement with the casing C when released for upward movement relative to the body I0. 'I'he slips II are provided with plain or untoothed tails 26 below the wedge faces I8. The lower ends of the tails 26 are pitchedV downwardly and inwardly to cooperate'with -the pitched shoulder I9. The engagement of the tails 26 with the shoulder I9 assists in holding the slips retracted. Sloping bores 21 arel provided in the body I0 and extend downwardly from the shoulder I3, see Fig. 3. Pina 23 are secured to the slip tails 25 and project downwardly into thev bores 21. Coiled springs 29 surround the pins 28 and are arranged under compression to bear against the bottom walls of the bores 21 and the lower ends of the slip tails 26. The springs 29 urge the slips II upwardly to be expanded through cooperation with the wedge faces I3. In practice there may be two springs 2'9 for actuating each slip II and the springs are preferably spaced equidistant from the longitudinal axes of the slips. Means l--is-preferably provided to connect the several slips Il for simultaneous and uniform actuation. An annular internal groove 30 is formed-inthe inner sides of the slip tails 23.

Asetting of the slips I I to seal between the body Il and the interiorof the casing C. The packing means I2 includes an annular or tubular body of packing 32 surrounding the body I0 above the jcoupling I4. The packing 32 may be formed of lead or similar materialthat is capable of lateral distortion or expansion when subjected to longi- The means I2further includes a'follower ring or gland ring 33 surrounding therbody I0 above the packing 32. The ring .33 is'longitudinally shiftable on the body I0 and partially covers the slots I1. With the parts in the unactuated positions'the upper end of the ring 33 is spaced a short distance below the plane occupied by the upper ends of the slots I1. The ring 33 is preferably provided with an internal upwardly facing 'shoulder 34 initially engaging the shoulder I6. The lower end of the ring 33 engages the upper end of the body of packing 32. This end of the'ring 33 slopes downwardly vand inwardly and the upper end of the packing 32 is correspondingly sloped. The upper end of the coupling I5'is pitched downwardly and outwardly and the lower end of the packing 32 is correspondingly pitched. It will be seen that downward movement'of the ring 33 relative to the body I0 compresses the packing 32 to expand it into sealing engagement with the casing C.

Means may be provided for holding the ring 33 in its down position or actuated position. Grippers or slips 35 may be set in circumferentially spaced slots 36 in the interior of the ring 33 to grip the body I0 and prevent return movement or upward movement of the ring 33 following its actuation. The cooperating rear faces of the slips 35 and inner walls of the slots 36 slope downwardly and inwardly so that the slips are automatically expanded or actuated in the event the ring 33 tends to return or move upwardly with respect to the body I0.

The releasable operating connection I3 serves to connectthe hanger body I0 and the associated parts with the setting string S to provide for the operation of the slips I I and the actuation of the packing I2 by simple manipulation of the string. It is an important feature of the invention that the connection I3 provides for the full dependable actuation of both the slips II and the packing means i2 without the necessity of engaging Vthe liner L against the bottom of the weiland in situations where the liner L is immovably stuck in the well. The operating connection I3in- 31.` The thread 42 and the packing-actuating forces.

'in the string s to cludes blocks 31 arranged in the body slots I1. The blocksv3'1 are Vadapted to move vertically in the slots I1, being shorter than the slots and tted for free vertical movement. The vertical edges of the blocks respect to the longitudinal axis of theftool to Aride on the side walls ofthe slots I1; The blocks 31 are secured to the actuating ring 33 of the' packing means I2. The vouter sides of the blocks 31 are shaped to engage against the interior of the ring 33 and spaced screws 38 secure the blocks 31 to the ring 33.? Means is preferably provided to directly `transn'iit downward forces 'from the blocks 31 to the ring 33 to relieve the screws 38 of lsuch forces. on 'the upper ends Aof the blocks 31 and engage downwardly against the upper end of the ringf33. The flanges 39'serve'to directly transmit vertical loads and forces from the blocks SI1y to the ring33 for the actuation or expansion Lof the packing 32.' I

31 are flat and radial with i .Lips or flanges 39 are provided'.

spring, assembly. `.includes fan" upper sleeve 50v freely /slidable en the string S V and a'lower sleeve I SV'enga'ging around another trol.'E

The releasablel operating connection further includes -a member 40 secured to the .setting string S and having threaded'engagement with the blocks 31: up of lengths t nected by couplings' preferably provided. with righthand threads, and the connecting member 40 is suitably secured to the lower` end ofj. the string. A s tubular part provided in its upper end with a tapered socket 4I for vreceiving the threaded loweryendof, the 'setting' string S. An external square thread or other free running thread' 42 is or stands of pipe `or tubing'conprovided on the member 40 to matey with thread' portions 43 formed on the inner vsides of the blocks the thread portions 43 the lefthand direction to ,adequately 'transmit Under. certain conditions of operation the thread"42jandfthe thread portions`43 operateupon rotation'o the are preferably pitched in and are heavy or coarse string S to produce upward movement'iofthe string relative to the body lo and the thread 42 is y of course readily disengaged or unthreaded from the thread portions 43 when the setting string is to be withdrawn from the well.4 Y

kIt is preferred to provide a slack `connection With'the mandrel 44 and barrel ,45 in an inter# mediate position, Where the head 41 is between. the ends of the barrel 4.5, the thread 42 and' lthread portions v43 are relieved of the weightof the string S.

' The settingA string S may be madev illustrated the member 4 0 may be. a

Thel slack connection or bumpersub Yjust 'nal movement between relieve the thread v42 and sleeve 53 are these parte.,

lZI .t0 returnlhmurgh the casing C ag will b e later. tdescribed."""-vr`| 1- The controln I4 Ais operable vvto initially hold the slips, Il retra'cted .and is released or manipulated by the string S to free thef'slips I I for actuation by their respective "springs 29.4V 'I he'control I4 includesv a vfriction draglneans or `friction spring assembly for engaging in the casing vlC.V .The

element of the con- Spaced 1 ontwardl'y bowedleaf fsp'ringsi v..52 .extend betweenand connectthe sleeves and 5I. The springs 52 Vserveito',frictionally engage in the casing to resistverticalmovement'of the sleeves 5'I`and 52 and thep'arts connected therewith.A

' The' controlli 4' further4 includes ratubeor sleeve "53 'shiftably surrounding the setting strings VVand extending' ythrough ,the vlower spring ,sleeve 5s; f A cenar orner 54j isprvidedjdn 'the upper end of vthe sleeve 5r3jand is engageable with the l,upper endof 'the' sleeve y5I .so that rthe rspring Anenlargjementon head 5.5 is:

'end of the sleeve y5.3 and has a assembly may resistv downward movement ofthe' 'vided orner sleeve 5 lon the lfm el 'face 56 adapted to l rest" on the"seaty 2D. slip control ring 51'erigagesu.J around `the he`d'55.

Y The ring 51 is 'rotatably'conriected' with'th-Yhead 55. An 'internal groove 518` Visfprovidedfir'ithe ring 51 and screws 59' are threaded in Open'ngs in the head 55'ftofhaveftheirheade.receive "in the groove 'j 58. The"enflagemcntfoi the yscrews 59 in jthej groove 58v p` ventsrelativel lon y t :insleeve 53v andythe'ring permitting free relativehturning"between `Fingers 6I) of reduced thickness 51 while preiect .fiori engagejfwith theuppe'ii ends of the slips I There gersll prjfect downwardly past the uppe`r`end of thebody. II!l to Contact the upper end'sjof the s1ipS,,I|. j. I`

[The control` HV` vfurther includesfa releasable `lock or latch'inecha'nism connecting the .sleeves `5I and'53with -Vthe 'string ;S in positions where the'slips. II are held 'retracted by the lingers 60. This lock or latch mechanism includes'two 'diametric'all'y' opposite .pins or lugshGI oritheV set- 'ting string S. Sets of 'slots are providedin'the sleeves A5I and 53 towreceive or cooperate Awith the lugs 6I, see Fig; 10'. The slots inthe inner e ksubstantially'Lshaped'havingv,horizontal upper arms. 62"'andV vertical legs 63 Vextending downwardly fromu the` `arms '62.' The legs 63 continue' downwardly through the sleeve 53` to the lower en'dof the head55 being inthe nature' of grooves "where they pass through the .Means is preferably associated with the setting string S andthe connecting means I3'tofdeliver washing fluid or circulation fluid to the 'liner' L. This means may comprise a wash pipe 4.8 threaded inthe lower end of themember 40 t`o project downwardly through the body I 0.' The pipe 48 may be of any selected or. requiredlength and v carries onev or more packers 49v for sealing with 'the interior of the liner L.V Fluid is adapted to head.` The arms l62 ofthe slots-areshapedand t.iproportionedYto: normally receive thelgs 6I with only working clearance'between the 4upperfand lower ends Iof thelugsand thelvupperandt'lower walls ofthe Aslotarms'. As illustrated the lugs 6I may have substantially flat" vertical sides'and t 'founded upper 'land iiower ends: *The S101; l legs e, The outersleevefSI 'h'as a'lpa'irjofj d iametrically oppositeslots of invrtedfJ-shape'for receiving or A y lThe lslots irijthe` sleevev 5I have horizontally extending arms 64 Leojperating "with the Alugs 6I;

fdisch'arge from thejlower end ofy the .pibe 4'8f`to enter.v the liner/L andljpass fout through the vforations'P of thelirne'rtov Wash the same.

4wash-fluiddischarginglfrom the perforations P L passes upwardly around'thelinerL to the ports gaat.

the lower 'end' ofy theA ring'51"and I the 'slot arms faces f '5 I to prevent relative ferai or the 1ine r narigereonstruction. In this "arrangement the slots. i1 arereplaced by vertical Vand has its upper to grip ,the interiorof above thetube12'. e l In operation the liner' han ger is assembled of the setting string.

"and secured to the lower end l l r to the hangerbody a shortl distanceA yand 1 vraising of 1 the string wardlyinthe "slot arms vM of sleeve I." The and legs '35 l extending arms'. :The arms 64 are e 62 in thesleeve'n sothat the lugs 6| have considerable vertical movement or play 'in them. A sloping lug-retaining face' 33 is prodownwardlyl from the 63 slope'upwardly legs B5 so that the horizontal slots are vrestricted in width where they join the legs .35.' The telescopically related sleeves 5l and 53 are keyed against lrelative turningl A peg or key 6 1 isjilxed to the sleeve 5 3 and cooperates arms 164 or the with a vertical internal key-way` 68 in thesleeve With the parts 'in the `initial positions thelugs 'I 6I occupy"the'finner portions'fof the slot arms e 6 6 jon the sleeve 5I' of the spring-[assembly preventfthelugs 3| `from unintentionally l reaching the vertical legs the string S'is made' the liner hanger` Thus; the latch means depend# in -thepositions' where the `slip`s Il are retractedndverticalmovement and 63 and ,85 of the slots `when up and run into t c w'ell-with on its lower end. ably retains the parts turning movement of the string S accompanying the'lowering of'theftoolthrough the well' ,can

Inot cause premature release of the slips.f

' gland ring w shiftablysurrpunds the body me end at the body shoulder- |69.r v

Fingers 1I are: provided on theupperjendot the glandring 33Il and are received inf the notches 1l. The blocks31 employed"i'lthefpreviously considerablyv wider than turningbetween the sleeves.

body. lll* from'its .shoulder/I3". 'The packing klowed to lower.4 ment of the string S the body I0 and the parts "carried thereby of course vided on the lower wallof each slot arm. 'The and toward the vertical 'companied by'actuatio'n of lthe slips Il.

u the springs 23 -wedge faces During this downward movemove downwardly with the string but the springs 52 frictionally engaging in the casing vC hoidvthe sleeve 5I against downward movement. The nut 54 contacting the upper end of the sleeve Sljholds the sleeve 53 against downward'movement' and the lugs il on the vdownwardly moving string S pass downwardly in the slot legs 63 and B5. movement of the body ill with the string S is ac- The sleeve 53 carrying the ring 51 and its fingers is held against downward movement by vthe spring assembly as above descr bed, and when the body I0 moves downwardly'withjthestrings move'the L slips lll upwardly on the I8 so1 that they are expanded by the wedge faces. Any continued downward movese'rve'd that the] slips I ably actuated I strings without thene'cessity ot engaging the Fig. 11- of'thedrawings illustrates' ajmodiiied f described formqofthe invention arerreplaced byl tube 12 enters theseries ofngers'1l and rivets 13 or similar `securing members thengers 1 I` with the tube 12.

rigidly connect The lower vend of thetube 12 rests -on upwardly facing. shoul/f' dersll onthe inner sides of thenn'gers v1i for 4 v th'edirect transmission of ldownward forces from Slipsorgrippers 15 are thetu'be to the ilngers.

tube 12 andare adapted arranged in slots in the return" movement o r upward vmovement "of the with the thread `42 of construction'the body I'may besectional and the body ing to. 'prevent ment ofthe body I0 following expansion of the slips Ilbyfthe springs 28 merely further expands or sets the slips 'so that they obtain a tighter with the casingmC. vIt will beob- I are 'fully and. dependby simple manipulations of the engagement liner L with the, bottom of the well: and without dragging the 'freed or expanded slips through thecasing. 'Following the setting or actuation of the slips Il the linerL may be washed or ilushed out. To perform this f iS Dumped down throughthe from the lower thus`;` 'discharged "through the perforations P to wash the same and operation a suitable flushing uid string S to discharge into the liner L passes out then flows up in the annular'passase between the liner L and the interior of the casing C. Upon reaching the ports 2| the uid flows into the body I0 and continuesjupwardly through'the vbody to C above the body. The

discharge intor the casing through the vlower ends -iluid is free to discharge or the slot iegs sa end-through the space that occurs between the seat '20 and the corner surface V5$ ofthe springsupported sleeve 53. The improved liner Ahanger of the present invention makes full provision for the washing of the liner L and vis constructed so that the solid matter may lreadily passup through the linerhanger conma'y'have a rthreaded connection 11 immediately the following descriptolloj, inclusive, is employed.

vell in the lusual manner' to bring the liner L tothe desired position. `Wi th jthe'liner L in the vsetting' string" S is raised 'turned to the right. .The S moves the lugs '6| 11pselected position the L -51S' transmitted t0 packing 32 yring 33 bearing on the upper struction'without sanding up' any of the parts.

Following the settingv of the slips il, when it is notdesired to ush the liner L, or following the above described liner flushing operation, 4the is actuated by simple manipulation of the string that a substantial weight or 31 threaded 40 on the string. Asuthe body i0 isheld against downward movement by the slips Il vgripping the casing C, the downward 'preesure' applied tothe blocks 31 serves to actuate orcompress the packing 32.' The downward force Y the'ring 33 by the'flanges 3l bearing on, the upper ends of the ring and the `compressesthe packing. Suicientforce or pressure-maybe applied tothe packing 32 to assure its illactuation. YIt blocks 3 1 are free to move is to be observed that the during actuation of the packing'32.v Withfthe slips Hv set and the packing actuated the string `Sand the setting parts are released and withdrawn from the well. To accomplish this lthe string S is manipulated to bring The downward end oi the wash pipe'l( The fiuid A S.y To actuate the packing 32 under normal conditions the string S is lowered or allowed to settleso downpressure-isl applied to the blocks the'member end of the packinl down inthe slots I1 tubular body, packing means on the body operable under compression to seal with the well wall,

a gland shiftable on the bodyv tol transmitY come' i pression forces to the packing means, a setting mandrel, gripping means on the body operable to grip thewall of the well tohold the bdyfagainst downward movement so that a :downward force string and member whereby Vthe string may be manipulatedto move the 'body andr actuate the packing, friction `meansy arrangedto have rela.- tive movementzfwithrespect to". the string and. body having.: movement-'resisting f vengagement l withA the wall of Y thelwell; a part` connected with on the gland may actuate' the packing means, spring means tending -to operate the 'gripping means, 'means for frictionallyengagingthewell wall'to 'hold the'gripping means retractediand releasable'b'y manipulation-'of' the" mandrel to ,l

allow actuation ofthe grippingmeans, and a releasable connectionfbetwee'n the gland and mandrelk whereby the last namedmeansmay bereleased and the packing means actuated by manipulation of the mandrel. f f

A'1. In a well tool foruse on'a "well string, a tubular body having longitudinal'slots,` packing means on thebody operable under compression to seal between the -body and the well walLmembers shiftable in the slots toi transmit compression forces to the packing means, a mandrel'on the stringr received in the body,v gripping means on the body operable to grip the wall ofthe well to hold the body against downward movement so that a "downward 4force on the members may 1 actuate the packing means, spring means'tending to operate the gripping means'means for holding the gripping means retracted releasable by relative movement between thebody and string, and f releasable screw threads on the -mandrel and members operable upon? rotation of the 'string to produce said relative movement and operable to transmit vertical forces from themandrel totheV members for the actuation of thepacking means.:VA 8. In a well tool for use on a well string,l a

tubular body having longitudinal slots, packing means on the body operable when compressedto seal with the well wall, members shiftablefin the vto slots to transmit compression forces to thepacking means, a mandrel part on the string received in the body, gripping vmeans on the body operable to grip the wall of Vthe' well to hold the 'body Y against downward movement so that a downward I force on the members may actuate'lthe' packing means,r means tending to operate the gripping means, holding means `for normally holding the' gripping means retracted, the holding means be- Aing arranged to have relative movement with l respect to the string and body, areleasable Athreaded connection between the mandrelpart vand said members providingf'or movement Vof the body'by the mandrel and for the application'of packing actuating forces to the members, and a releasable latch connection between the string' and holding means for retaining. the holding means in the position where the gripping means is retracted and releasable by manipulation of the string to allow actuation of the gripping means,

the latchconnection coupling the holding means tothe string for withdrawal from thewell therewith.

9. A liner hanger for securing a liner ina Ywel] and adapted to be operated on`a setting string comprising a tubular hanger body, packthe friction means normally holding ithe rgripping means inactive, and apinand slt connection betvveenfthe Vstringandffrictionfmeans initi- Ytar'ding engagement' withk ythe well wall and 'including" a party shiftably engaging4 around v'the sleeveandhaving limited rinovementvvith respect to the` sleeve, the ksleeve and part having "bayonet .slotsfand a pin onrthe string normallyco'operating with the, slotsto hold the sleeve in the position where, the grippingl means is held inactive and movableinth'eV bayonet slots to allow relative movement 4Vbetween 'the body 'and sleevetoffree i the gripping VV'meansA for," operation,

l1.'Y In a.v well tool to vbeoperated on vawell stringa body movable withitne string, gripping means carriedby the'A body forgripping the well 'wall` meanstending -to, cause, operation ofthe gripping means, a sleeve shiftable `on the string yforholdinglthe gripping means retracted, friction means Vhaving movement-rewarding engagementwith V thevwell wall and including a part. shiftably engaging around the sleeve and having limitedmovement 4,witlirespect to the sleeve, the

sleeve having' a bayonetslot, the part having a bayonet slotv whose 'lateral arm has a pitched Y stop shoulder; and a pinon vthe string normally engaged in rthelateral arms vof the slots to hold the sleeve inthe position ,Where the gripping Vmeans is retracted, the pin being restrained against movement into the longitudinal arms of the slots bythe stop shoulderrthepin being .positioned for movementover the lstop shoulder by upward movement of; the string relative to the friction;means, upward movement orf. the lpin through said'longitudinal slotarms servingto Vfrec the gripping means foroperation.

'12. A well vtool vfor use on a setting string com? prising a body,"` packing means on thev body for sealing with-the well wall, slips. on the body spacedf longitudinallyfrom the packing means land operable to grip the well wall, meansrtendl ing tooperate .the slips,- a control for holding the slips retracted releasable by manipulation of the setting string,\=and av releasable connection between the string and the packing means whereby I the string may be manipulated to actuatefthe ing ronY the body operable when compressed to Y `seal between the body andthe wall of the'well,

gripping means on the body operabiento grip the wall of the welltol suspend the body therein, means tending kto operate the gripping means,

a member having limited movement on the body for transmitting actuating forces to the packing,

a releasable threaded `connection betweeny theY f the latter.

packing means following actuation of the slips and may then be disconnected from the body, the

body having ports between the slips and packing Vmeans for admitting fluid that may be circulated up past the packing means before actuation of GLENN D. JOHNSON. s SPENCER W. LONG. 

